Improvement in diamond key



@uiten faire ige-tmf fr.

B. FQ SOUTHGA'TE, 4OF BRIDGEWATER, VERMONT.

Letters Patent No. 68,538, dated September 3, 1867.

IMPROVEMENT IN DIAMOND KEY.

@lgs Stlgehult referrer tu iu tlgtse tttersintent mit mating mrt nf tte time.

TO ALL WHOM IT MAY CONCERN:

Be it known that I, B. F. SOUTHGATE, of Bridgewater, Windsor county, Vermont, have invented a new and improved Diamond Key; and I do hereby declare that the following is a full, clealgand exact description thereof, which will enable others skilled in theart to make and use the same, reference being had to the accompanying drawings, forming part of lthis specification.

This invention relates to an improved key for holding cranks, shafts, and other machinery, and consists in a wedge-shaped key, the section whereof is a diamond fitting into a V-groove in the orank'or shaft, and into a A-groove, corresponding thereto, in the bearing.

The accompanying drawing is a perspective view of my improved diamond key.

A is a shaft, or crank, or other piece of machinery; B, a. hearing, to which it is to be keyed. C is my improved diamond and wedge-shaped key. A V-shaped groove is made in A to receive the key, a corresponding A-shaped groove existing in the bearing B. v i

This forni of key is specially adapted for use when the work has to be done with chisel and file, and

especially where there is a backlash motion. Should the key become loose, or be too small for the groove, a Y

strip of brass, b, may be inserted, as shown, and the key driven up against it.

-Having thus described my invention, what I claim as new, and desire to secure hy Letters Patent, ius- The diamond key C, fitting in V A-Shaped grooves in shaft and bearing, or their respectiveequivalents, in manner and for the purposes substantially as described.

B. F. SOUTHGATE.

Witnesses ZIBA A. MARSH, J ONAH STEARNs. 

